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| Abstract No.: |
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| Title: |
Nanoindentation on solidified droplets provides a new tool for assessing the micromechanical properties
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| Authors: |
Karlis Gross / Uni of Melbourne, Australia
S. Saber-Samandari / Dept of Mechanical and Manufacturing Engineering, Uni of Melbourne, VIC 3010, , Australia
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| Abstract: |
Examination of individual solidified droplets provides an important indicator for the properties provided by each component splat in the coating. To date, nanoindentation has been conducted on polished cross-sections or randomly placed on the surface of the coating. Indentations placed directly on splat features provides a new capability for measuring mechanical properties of individually flattened droplets.
Flattened solidified droplets were characterized by scanning electron microscopy for morphology, micro-Raman spectroscopy for phase composition and nanotopography for the height of the solidified droplet. Nanoindentation was performed on well-flattened solidified droplets thermally sprayed from 20-40, 40-60 and 60-80 micron particles to measure the hardness and elastic modulus. The critical load was found to different for the different sized droplets and values of the indentation revealed a large scatter. It was revealed that both the elastic modulus and hardness were lower for the solidified droplets and this was attributed to the amorphous phase. Other measurements on crystalline deposits revealed that mechanical properties of the thermally sprayed hydroxyapatite is lower compared to sintered hydroxyapatite. The variability in the results will be discussed and recommendations provided for conducting nanoindentation on separate solidified droplets.
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